SWITCHING MODE POWER SUPPLY, APPARATUS AND METHOD OF SUPPLYING POWER BY USING THE SAME, AND IMAGE FORMING APPARATUS THEREFOR
First Claim
Patent Images
1. A switching mode power supply (SMPS) usable with an image forming apparatus to receive an alternating current (AC) power from an external electric power supply source and to output a direct current (DC) power, the SMPS comprising:
- a transformer to transform an electric power input to a primary coil and to output the transformed electric power to a secondary coil;
a switching unit connected to the primary coil to adjust the output power of the transformer; and
a blocking unit to block an electric power input to the switching unit according to a supply state of an electric power to the image forming apparatus.
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Abstract
A switching mode power supply (SMPS) usable with an image forming apparatus receives an alternating current (AC) power from an external electric power supply source and outputs a direct current (DC) power. When a supply state of an electric power to the image forming apparatus is turned off, electric charges charged in a capacitor of the SMPS are discharged.
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Citations
21 Claims
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1. A switching mode power supply (SMPS) usable with an image forming apparatus to receive an alternating current (AC) power from an external electric power supply source and to output a direct current (DC) power, the SMPS comprising:
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a transformer to transform an electric power input to a primary coil and to output the transformed electric power to a secondary coil; a switching unit connected to the primary coil to adjust the output power of the transformer; and a blocking unit to block an electric power input to the switching unit according to a supply state of an electric power to the image forming apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of supplying an electric power of a switching mode power supply (SMPS) in an image forming apparatus, the method comprising:
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transforming an electric power using a transformer of an SMPS; determining a supply state of the electric power to an image forming apparatus; and blocking the electric power input to a switching unit that adjusts an output of the electric power according to the determined supply state of the electric power to the image forming apparatus. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An image forming apparatus comprising:
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an image forming unit to perform an image on a printing medium; and a switching mode power supply (SMPS) to receive an alternating current (AC) power from an external electric power supply source and to output a direct current (DC) power to the image forming unit, wherein the SMPS comprises; a transformer to transform an electric power input to a primary coil and to output the transformed electric power to a secondary coil; a switching unit connected to the primary coil to adjust the output power of the transformer; and a blocking unit to block an electric power input to the switching unit based on a supply state of an electric power to the image forming apparatus. - View Dependent Claims (16)
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17. A switching mode power supply (SMPS) usable with an image forming apparatus to receive an alternating current (AC) power from an external electric power supply source and to output a direct current (DC) power, the SMPS comprising:
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a transformer having a primary coil and a secondary coil to generate a driving voltage; a switching unit configured to receive the driving voltage and to perform a switching operation on the primary coil according to the received driving voltage; and a blocking unit configured to block the driving voltage from the switching unit according to a supply state of an electric power of the image forming apparatus. - View Dependent Claims (18, 19, 20, 21)
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Specification